The week-long, record-breaking torrent of trading -- so intense and prolonged that many young trade runners passed out on the floor of the National City Bank from exhaustion -- pushed acting New York Stock Exchange president Richard Whitney to suspend Friday's session so that brokerage firms could catch up on their paperwork.

"The most dramatic decline in market history ... appeared to have reached a definite bottom yesterday afternoon," wrote The Washington Post. "Everybody in Wall Street," wrote The New York Times, "was talking about psychology." On Oct. 30, "A new era of good feeling pervaded the financial district. ... Smiles of hope, if not of confidence, took the place of poker faces."

Even nonagenarian oil billionaire John D. Rockefeller -- founder of the broken oil monopoly that created ExxonMobil(NYSE:XOM), ConocoPhillips(NYSE:COP), and Chevron(NYSE:CVX) -- got into the action, declaring that earlier declines had gone too far and that he was buying "substantial amounts" of stocks. Rockefeller's comments to reporters echoed earlier statements by business and political leaders about the American economy's strength and integrity, and he was said to be particularly interested in the shares of the Standard Oils that later became ExxonMobil and Chevron.

For many traders, Oct. 30 seemed to signal the end of a devastating bear market, and for a while, it seemed that the worst was really over. The Dow would only decline by another 4% over the rest of 1929. Then 1930 arrived, and by year-end, hope would be crushed by a 12-month decline of 34%. The following year was even worse, as 53% of the Dow's value was destroyed. For the time being, however, worried investors on Wall Street finally had a moment to catch their breath.

Aliens (not really) among us On Oct. 30, 1938, millions of Americans received an unexpected shock when they tuned their radios to their local CBS(NYSE:CBS) radio affiliate and heard what seemed to be a firsthand account of an alien invasion. Orson Welles, reading from a script based on H. G. Wells' The War of the Worlds, put on a career-making performance based on humanity's futile resistance against advanced Martian technological destruction.

The broadcast, meant as the Halloween special for a dramatic radio series, became one of the most enduring pieces of American pop culture. Within weeks, thousands of newspaper articles were published about the broadcast's impact. CBS was the target of many frivolous lawsuits resulting from "mental anguish" caused by the broadcast. The broadcast also spurred Welles' ascent to film greatness, which led to many other indelible moments of American popular consciousness.

Welcome to the big time, Ronald The Dow was well into a roaring bull market when it decided to add two consumer superstars to its roster on Oct. 30, 1985. Altria(NYSE:MO), then Philip Morris, joined the index after acquiring previous Dow component General Foods, becoming one of the few Dow consituents in history to actually buy its way onto the index. McDonald's(NYSE:MCD) was the other addition, replacing American Brands, which had been the Dow's tobacco-industry representative before Philip Morris' ascension.

The Dow closed at a then-record high of 1,376 on Oct. 30, 1985. It has since risen by just more than 850%, but both Philip Morris (plus its spinoffs) and McDonald's have trounced that rate of return over the same time frame. Altria shareholders have earned a total return of almost 4,400% since the company joined the index -- a gain that includes shares of Philip Morris International(NYSE:PM) that were distributed in the 2008 spinoff. McDonald's shares have grown by almost 3,400% since joining the Dow. Altria was replaced in 2008, but McDonald's remains an important part of the Dow to this day.

Fool contributor Alex Planes holds no financial position in any company mentioned here. Add him on Google+ or follow him on Twitter @TMFBiggles for more news and insights.

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Alex Planes specializes in the deep analysis of tech, energy, and retail companies, with a particular focus on the ways new or proposed technologies can (and will) shape the future. He is also a dedicated student of financial and business history, often drawing on major events from the past to help readers better understand what's happening today and what might happen tomorrow.